Practice 30 Cisco Network Consulting Engineer questions covering SDN, routing protocols, and client solution design.
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Kimberly is a freelance writer and editor with a decade of experience in the education field, including her time as a pre-kindergarten teacher.
This is an interesting question. Most networking professionals will understand the layered transport model and can name each layer and its purpose. However, many may not be able to discuss why the model was developed and what led to this. While having a historical perspective of your industry and profession doesn't help you with your day-to-day operations, it will demonstrate your qualifications in the field and could differentiate you from other candidates.

Kimberly is a freelance writer and editor with a decade of experience in the education field, including her time as a pre-kindergarten teacher.
"The main reason the network industry uses a layered transport model is that it facilitates the management of each function in the movement of information across the network. It also facilitates systematic troubleshooting. This is because the layered model clarifies what general function is associated with which layer. Also, changes in one layer can occur without changing other layers, thereby allowing the network engineers to fix issues associated with one of the layers and to optimize the performance of the network by tweaking each layer."

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Written by William Swansen
30 Questions & Answers • Cisco

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